Bilstein B6 Performance dampers are a performance upgrade to OE dampers designed to be paired with the OE factory spring. These dampers offer application specific valve settings with a monotube design to bring out the best handling performance of a vehicle. Each damper is rigorously tested for quality that meets or exceeds OE standards. B6 Performance dampers will provide improved safety and handling performance with the added benefit of world-famous Bilstein quality. BMW 320i xDrive 2015-2013; 328d xDrive 2014; 328i GT xDrive 2014; 328i xDrive 2014-2013; 335i GT xDrive 2014; 335i xDrive 2014-2013; 428i xDrive 2015-2014; 428i xDrive Gran Coupe 2015; 435i xDrive 2015-2014; 435i xDrive Gran Coupe 2015 BMW 228i xDrive 2016-2015, 230i xDrive 2017, 320i xDrive 2017-2013, 328d xDrive 2017-2014, 328i GT xDrive 2016-2014, 328i xDrive 2016-2013, 330i GT xDrive 2017, 330i xDrive 2017, 335i GT xDrive 2016-2014, 335i xDrive 2015-2013, 340i GT xDrive 2017, 340i xDrive 2017-2016, 428i xDrive 2016-2014, 428i xDrive Gran Coupe 2016-2015, 430i xDrive 2017, 430i xDrive Gran Coupe 2017, 435i xDrive 2016-2014, 435i xDrive Gran Coupe 2016-2015, 440i xDrive 2017, 440i xDrive Gran Coupe 2017